/// <summary>
/// Returns TRUE if this is an orthonormal transformation with the given
/// tolerance.
/// </summary>
/// <remarks>
/// Returns TRUE if this is an orthonormal transformation with the given
/// tolerance. The orthonormal: Rotation or rotoinversion and shift
/// (preserves lengths of vectors and angles between vectors).
/// </remarks>
/// <param name="tol">The tolerance value.</param>
public bool IsOrthonormal(double tol)
{
com.epl.geometry.Transformation2D r = new com.epl.geometry.Transformation2D();
r.xx = xx * xx + xy * xy;
r.xy = xx * yx + xy * yy;
r.yx = yx * xx + yy * xy;
r.yy = yx * yx + yy * yy;
r.xd = 0;
r.yd = 0;
return(r.IsIdentity(tol));
}
